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Author

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1		-XWiki.Edwin
	1	+XWiki.Xiaoling

Content

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1		-
2		-
3	3	**Table of Contents:**
4	4
5	5	{{toc/}}
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16	16
17	17	= 2. What is Signal Strenght? =
18	18
19		-Signal Strength is same as AT+CSQ command output. When you run **AT+CSQ** and NB-IoT module return **AT+CSQ=99,99**. It means NB-IoT Sensor doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~~31.
	17	+Signal Strength is same as AT+CSQ command output. When you run (% style="color:blue" %)**AT+CSQ**(%%) and NB-IoT module return (% style="color:blue" %)**AT+CSQ=99,99**(%%). It means NB-IoT Sensor doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~~31.
20	20
21	21	(((
22	22	Below is the definition for the (% style="color:blue" %)**AT+CSQ**
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31	31
32	32	== 3.1 Check whether module detect the SIM card? ==
33	33
34		-You can see if the output shows the **IMSI number**. If NB-IoT module detects SIM card successful, There will be a IMSI number shown, this is from the SIM card. If SIM card not detect, please check:
	32	+You can see if the output shows the (% style="color:blue" %)**IMSI number**(%%). If NB-IoT module detects SIM card successful, There will be a IMSI number shown, this is from the SIM card. If SIM card not detect, please check:
35	35
36	36	* If SIM card is placed in correct direction.
	35	+
37	37	* Make sure there is power off / power on after insert SIM card.
38	38
39	39	== 3.2 Whether you use a NB-IoT SIM card that the module supports ==
40	40
41		-* Make sure the SIM card you use is a **NB-IoT SIM card**. It is different from normal SIM card we use for mobile.
42		-* If you use a NB-IoT SIM card, check whether the **Frequency Band** of this operator are in the support list of the NB-IoT Sensor.
	40	+* Make sure the SIM card you use is a (% style="color:blue" %)**NB-IoT SIM card**(%%). It is different from normal SIM card we use for mobile.
43	43
	42	+* If you use a NB-IoT SIM card, check whether the (% style="color:blue" %)**Frequency Band**(%%) of this operator are in the support list of the NB-IoT Sensor.
	43	+
44	44	== 3.3 Whether the antenna connection is good ==
45	45
46	46	See  the connection of Antenna Path is loose.
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54	54
55	55	=== 3.4.1 Extend attach time ===
56	56
57		-User can use AT Command to extend network acquisition time.For example **AT+CSQTIME=10** will extend the network acquisition time to 10 minutes.
	57	+User can use AT Command to extend network acquisition time.For example (% style="color:blue" %)**AT+CSQTIME=10**(%%) will extend the network acquisition time to 10 minutes.
58	58
59	59
60	60	=== 3.4.2 Lock Frequency Band ===